Response Analysis
Developed by
SDA - Software Design Ahnert GmbH
Germany
EASERA Software © SDA
All Worldwide Rights Reserved
2002-2004
www.sda.de
Electronic an d Acoustic System Evaluation and
Response Analysis EASERA is an all-new acoustic measurement program developed by Software Design Ahnert GmbH (SDA), a sister company of
Acoustic Design Ahnert (ADA), the creator of the world famous EASE acoustic simulation software.
EASERA consists of four independent modules:
Measurement module
Signal generator
Real time analyser
Post processing module
A fifth module, distributed primarily by Gold Line (www.gold-line.com) implementsTime Delay Spectrometry measurement and processing entirely in software.
EASERA provides both data acquisition with a variety of stimulus signals including Time Delay Spectrometry, a sweep, a MLS or a noise excitation signal, and a post processing engine to calculate all
acoustic functions or measures according to ISO Standard 3382 and higher.
The real time analyser provides multiple ways to perform a fast onsite analysis or to obtain a precise view of the surrounding acoustic environment.
Although many of these tools are available in one form or another in several products, EASERA is the first to bring them all together in one unified measuring package.
Now, thanks to EASERA, audio professionals can access the best features of all these masurement techniques from a laptop PC with a sound card.
- Sweeps (white, pink, weighted)
- MLS - Maximal Length Sequence (white, pink,
weighted)
- Random noise (white, pink, weighted)
- Sinusoidal signal, impulse and step
- Custom signals, based on WAV file
format
- User-defined signals, created with signal generator
- TDS Sweeps (With TDS module)
Supported Hardware
- Supports any PC sound card, preferably a USB device
- Time-synchronized input and output clocks are recommended for
delay measurements
- Sampling Rates from 8kHz to 192kHz
- Bit resolution hardware-depending
up to 32 bits
- Supports MS Windows Direct
Sound, Wave and ASIO drivers
- Variety of hardware selection and
calibration possibilities
- Choice of Type of
Measurement
- Selection of Measuring
Conditions
- Proposal for Appropriate Stimulus Signal
Types of Measurements
- Single channel
measurement
- Dual Channel FFT
- Reference measurements
- Record mode for use
of external sound
sources
- Playback mode
- Measurements with up
to 32 input channels
- Measurements with up
to 32 output channels
- Unlimited number of
repetitions and averages
- Support of „Presend“-
functionality
- Real time signal supply
to EASERA allows for
so-called sourceindependent
measurements Features
- Automated input volume control for maximum S/N
- Test function to simulate and prepare measurement setup
- Compensation for hardware frequency
response by means of
reference measurements, either using the second
channel or by measuring it in advance
- Sweep generation for
different parameters, such as start and stop frequency, weighting
- MLS generation, for all
orders and with serdefined
pre-emphasis
- Random noise, with
different weightings
- Sinusoidal signal, impulse and step function creation
- Created files can be
saved in a WAV format
for measurements or
playback
- Different dB-weightings,
such as A-weighting etc.
- Various display resolutions, logarithmic
or linear
- Adjustable FFT intervals
- Tolerance mode
Displays
- Real time level chart
- Level histogram
- Spectrogram
- Waterfall presentation
- Room -Acoustic
Parameters conform to
ISO 3382, for example:
EDT, T10, T20, T30, D50, C80, Center Time,
MTF calculation and STI
- Electro-Acoustic
Parameters, for example: Direct SPL, Total SPL, L50, Arrival Time, AlCons
- Additional Parameters,
such as: RMS, Noise
Level, Crest Factor
Displays
- Time Domain views:
Impulse Response,
Energy Time Curve (ETC),
Schroeder Integral, Echo
Criteria
- Frequency Domain views: Magnitude, Phase, Group
Delay, Real Part, Imaginary Part, Smoothings and Averages, Integrals
- Tabular view
- Original measurement
data for inspection
- Overlay display to view and manipulate multiple data sets simultaneously
Features
- Number of data sets
that can be viewed is
limited only by PC memory
- FFT block size only
limited by PC processing
capabilities
- Automated
transforms, targetoriented
rather than function-oriented user interface
- Octave and Third Octave filters as in IEC 61260
- Noise level calculation and subtraction
- Import and export of data in all common formats, for example
WAV, MLSSA, TEF, EASE
- Resampling
- Support of all common electronic and acoustic units for display
- Increased noise immunity resulting from software based TDS tracking filter (With TDS module)
- User-defined Filters
- User-defined Windows
- Editing of data sets, such as addition or division
- Merging and cutting
of files
- Smoothing, Averaging,
Integrating, Differentiating
- Stepped Sine
- Continuous Pink Sweep
- Logarithmic or Linear
Resolution
Features
- THD, THD + N
- THD Spectrum
- Harmonic Spectra
- Relative Spectra
